Improvement in method of hanging reciprocating saws



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JAMi-is'A GARGE'TT; or ALMAMICHIGAN.

Letters Patent No. 92,716, dated July 20, 1869.

IMPRovEMENT INMETHon or HANGING RECIPROCATING saws.

The Schedule referred to in these Letters Patent and making part ot the same.

scription thereof, reference being had to the accompa-- nying drawings, and to-the letters of reference marked thereon, and being a part of this specification.

Figure 1 is a perspective view of my invention.

Figiue 2 is a side elevation ot' a saw, with its attachments.

Figure 3 is a plan-view, of my radius-bars and rockshaft,

Like letters indicate like parts in each figure;

'lhe nature of this inventionrelates to an improved method of hanging and operating sash, muley, and

gang-saws, by means of which an oscillating motion is.

given to the saws, the sawdust is entirely thrown downward through the cut, and a very large saving is made of friction in its operation.

The invention rInoreparticularly consists in so arranging fthe radius-bars, in connection with the rockshafa that the saw may be lined up without diicnlty or loss of time, by the use of. keys orset-sc'rews.

It also consists in an oscillating cross-head, by -means of which the upper end of the saw is operated in they slides without binding.

The inner ends of the radius-bars'are pivoted to the pitman in such a manner that the saw will, in its downward motion, commence its cut at the upper edge ot' the log, and diagonally thereto, and finish the-cut at the bottom of the log,havingyin its coluse from the top to the bottom, described the are of a circle, and at the saine time left the cut straight, or at right angles with the sides of the log. In its upward motion the lower end of the saw is thrown backward in the out, allowing the log to be fed up for the next cut without striking vthe teeth. The whole should be so arranged, that just asv the wrist-pin connecting the lower end of the pitinan to the crank-wheel has passed the upper cent-re, that being the point where it exerts the -least power, the least poweris required upon the saw. Y

A, iu the drawings, represents the'maiu drivingshaft, to the inner end of which is secured, in the.

usual manner, the crank-wheel B, provided with wristpin C, rotating in proper pitmau-strap I).

E is a pitlnan, the lower end secured to the strap D, while the upper end is pivoted, by means of the noddle-pin F, to the saw-buckle G.

H are radius-arms, their outer en'ds being secured to the rockshaft I by a tenon and mortise, and wedges J, or by set-screws, or any other wellknown and equiv-v alent device, while their inner ends are pivoted to the pitmau E, below the noddle-pin F.

By securing these radius-arms as described, the lining up of the saw'is readily done.

K is a saddle, rigidly secured to the upper end of the saw, and encloses a proper box, L, within which semi-rotates the pinfM, to each end of which is attached asuitable grooved slideQwhich operates upon the veiticalslides attached to the saw-guides N.

By thesenie'ans last described, an oscillating crosshead is secured, allowing the upper end of the saw to follow the motions of vthe lowel end thereof wit-hout binding.

At the point where the radius-bars are pivoted to the pitman, the latter should be slotted, and the pivoting-pin pass through said slot, and wedges, or otherconvenient devices, may be employed, by means ofwhich the pivoting-'pin may be raised and lowered, and held in position, to accommodate the length oi' the pitman.

What I claim as my invention, and desire to secure by Letters Patent, is

The adjustable radius-bars H, herein described, in combination with the rock-shaft I and slotted pitman E, when all these parts are arranged, constructed, and operating as and for the purpose above set forth.

JAMES GARGETT. XVitnesses H. F. EBEnTs, L. C. HYDE. 

